diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
index 16dfa40bdac388e7f0b6d5f55a7197886fd37404..42fc5a640df490ef70f4e1925defd0ed434ef17b 100644
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h
@@ -354,5 +354,9 @@ struct tcp_zerocopy_receive {
__u64 copybuf_address; /* in: copybuf address (small reads) */
__s32 copybuf_len; /* in/out: copybuf bytes avail/used or error */
__u32 flags; /* in: flags */
+ __u64 msg_control; /* ancillary data */
+ __u64 msg_controllen;
+ __u32 msg_flags;
+ /* __u32 hole; Next we must add >1 u32 otherwise length checks fail. */
};
#endif /* _UAPI_LINUX_TCP_H */
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index a1a17b64f8cd6296455fef83b8c595afef7860b3..e1a17c6b473c15013eccef90ac254b0ecc76782d 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -280,6 +280,12 @@
#include <asm/ioctls.h>
#include <net/busy_poll.h>
+/* Track pending CMSGs. */
+enum {
+ TCP_CMSG_INQ = 1,
+ TCP_CMSG_TS = 2
+};
+
struct percpu_counter tcp_orphan_count;
EXPORT_SYMBOL_GPL(tcp_orphan_count);
@@ -1739,6 +1745,20 @@ int tcp_set_rcvlowat(struct sock *sk, int val)
}
EXPORT_SYMBOL(tcp_set_rcvlowat);
+static void tcp_update_recv_tstamps(struct sk_buff *skb,
+ struct scm_timestamping_internal *tss)
+{
+ if (skb->tstamp)
+ tss->ts[0] = ktime_to_timespec64(skb->tstamp);
+ else
+ tss->ts[0] = (struct timespec64) {0};
+
+ if (skb_hwtstamps(skb)->hwtstamp)
+ tss->ts[2] = ktime_to_timespec64(skb_hwtstamps(skb)->hwtstamp);
+ else
+ tss->ts[2] = (struct timespec64) {0};
+}
+
#ifdef CONFIG_MMU
static const struct vm_operations_struct tcp_vm_ops = {
};
@@ -1842,13 +1862,13 @@ static int tcp_recvmsg_locked(struct sock *sk, struct msghdr *msg, size_t len,
struct scm_timestamping_internal *tss,
int *cmsg_flags);
static int receive_fallback_to_copy(struct sock *sk,
- struct tcp_zerocopy_receive *zc, int inq)
+ struct tcp_zerocopy_receive *zc, int inq,
+ struct scm_timestamping_internal *tss)
{
unsigned long copy_address = (unsigned long)zc->copybuf_address;
- struct scm_timestamping_internal tss_unused;
- int err, cmsg_flags_unused;
struct msghdr msg = {};
struct iovec iov;
+ int err;
zc->length = 0;
zc->recv_skip_hint = 0;
@@ -1862,7 +1882,7 @@ static int receive_fallback_to_copy(struct sock *sk,
return err;
err = tcp_recvmsg_locked(sk, &msg, inq, /*nonblock=*/1, /*flags=*/0,
- &tss_unused, &cmsg_flags_unused);
+ tss, &zc->msg_flags);
if (err < 0)
return err;
@@ -1903,21 +1923,27 @@ static int tcp_copy_straggler_data(struct tcp_zerocopy_receive *zc,
return (__s32)copylen;
}
-static int tcp_zerocopy_handle_leftover_data(struct tcp_zerocopy_receive *zc,
- struct sock *sk,
- struct sk_buff *skb,
- u32 *seq,
- s32 copybuf_len)
+static int tcp_zc_handle_leftover(struct tcp_zerocopy_receive *zc,
+ struct sock *sk,
+ struct sk_buff *skb,
+ u32 *seq,
+ s32 copybuf_len,
+ struct scm_timestamping_internal *tss)
{
u32 offset, copylen = min_t(u32, copybuf_len, zc->recv_skip_hint);
if (!copylen)
return 0;
/* skb is null if inq < PAGE_SIZE. */
- if (skb)
+ if (skb) {
offset = *seq - TCP_SKB_CB(skb)->seq;
- else
+ } else {
skb = tcp_recv_skb(sk, *seq, &offset);
+ if (TCP_SKB_CB(skb)->has_rxtstamp) {
+ tcp_update_recv_tstamps(skb, tss);
+ zc->msg_flags |= TCP_CMSG_TS;
+ }
+ }
zc->copybuf_len = tcp_copy_straggler_data(zc, skb, copylen, &offset,
seq);
@@ -2004,9 +2030,37 @@ static int tcp_zerocopy_vm_insert_batch(struct vm_area_struct *vma,
err);
}
+static void tcp_recv_timestamp(struct msghdr *msg, const struct sock *sk,
+ struct scm_timestamping_internal *tss);
+static void tcp_zc_finalize_rx_tstamp(struct sock *sk,
+ struct tcp_zerocopy_receive *zc,
+ struct scm_timestamping_internal *tss)
+{
+ unsigned long msg_control_addr;
+ struct msghdr cmsg_dummy;
+
+ msg_control_addr = (unsigned long)zc->msg_control;
+ cmsg_dummy.msg_control = (void *)msg_control_addr;
+ cmsg_dummy.msg_controllen =
+ (__kernel_size_t)zc->msg_controllen;
+ cmsg_dummy.msg_flags = in_compat_syscall()
+ ? MSG_CMSG_COMPAT : 0;
+ zc->msg_flags = 0;
+ if (zc->msg_control == msg_control_addr &&
+ zc->msg_controllen == cmsg_dummy.msg_controllen) {
+ tcp_recv_timestamp(&cmsg_dummy, sk, tss);
+ zc->msg_control = (__u64)
+ ((uintptr_t)cmsg_dummy.msg_control);
+ zc->msg_controllen =
+ (__u64)cmsg_dummy.msg_controllen;
+ zc->msg_flags = (__u32)cmsg_dummy.msg_flags;
+ }
+}
+
#define TCP_ZEROCOPY_PAGE_BATCH_SIZE 32
static int tcp_zerocopy_receive(struct sock *sk,
- struct tcp_zerocopy_receive *zc)
+ struct tcp_zerocopy_receive *zc,
+ struct scm_timestamping_internal *tss)
{
u32 length = 0, offset, vma_len, avail_len, copylen = 0;
unsigned long address = (unsigned long)zc->address;
@@ -2023,6 +2077,7 @@ static int tcp_zerocopy_receive(struct sock *sk,
int ret;
zc->copybuf_len = 0;
+ zc->msg_flags = 0;
if (address & (PAGE_SIZE - 1) || address != zc->address)
return -EINVAL;
@@ -2033,7 +2088,7 @@ static int tcp_zerocopy_receive(struct sock *sk,
sock_rps_record_flow(sk);
if (inq && inq <= copybuf_len)
- return receive_fallback_to_copy(sk, zc, inq);
+ return receive_fallback_to_copy(sk, zc, inq, tss);
if (inq < PAGE_SIZE) {
zc->length = 0;
@@ -2078,6 +2133,11 @@ static int tcp_zerocopy_receive(struct sock *sk,
} else {
skb = tcp_recv_skb(sk, seq, &offset);
}
+
+ if (TCP_SKB_CB(skb)->has_rxtstamp) {
+ tcp_update_recv_tstamps(skb, tss);
+ zc->msg_flags |= TCP_CMSG_TS;
+ }
zc->recv_skip_hint = skb->len - offset;
frags = skb_advance_to_frag(skb, offset, &offset_frag);
if (!frags || offset_frag)
@@ -2120,8 +2180,7 @@ static int tcp_zerocopy_receive(struct sock *sk,
mmap_read_unlock(current->mm);
/* Try to copy straggler data. */
if (!ret)
- copylen = tcp_zerocopy_handle_leftover_data(zc, sk, skb, &seq,
- copybuf_len);
+ copylen = tcp_zc_handle_leftover(zc, sk, skb, &seq, copybuf_len, tss);
if (length + copylen) {
WRITE_ONCE(tp->copied_seq, seq);
@@ -2142,20 +2201,6 @@ static int tcp_zerocopy_receive(struct sock *sk,
}
#endif
-static void tcp_update_recv_tstamps(struct sk_buff *skb,
- struct scm_timestamping_internal *tss)
-{
- if (skb->tstamp)
- tss->ts[0] = ktime_to_timespec64(skb->tstamp);
- else
- tss->ts[0] = (struct timespec64) {0};
-
- if (skb_hwtstamps(skb)->hwtstamp)
- tss->ts[2] = ktime_to_timespec64(skb_hwtstamps(skb)->hwtstamp);
- else
- tss->ts[2] = (struct timespec64) {0};
-}
-
/* Similar to __sock_recv_timestamp, but does not require an skb */
static void tcp_recv_timestamp(struct msghdr *msg, const struct sock *sk,
struct scm_timestamping_internal *tss)
@@ -2272,7 +2317,7 @@ static int tcp_recvmsg_locked(struct sock *sk, struct msghdr *msg, size_t len,
goto out;
if (tp->recvmsg_inq)
- *cmsg_flags = 1;
+ *cmsg_flags = TCP_CMSG_INQ;
timeo = sock_rcvtimeo(sk, nonblock);
/* Urgent data needs to be handled specially. */
@@ -2453,7 +2498,7 @@ static int tcp_recvmsg_locked(struct sock *sk, struct msghdr *msg, size_t len,
if (TCP_SKB_CB(skb)->has_rxtstamp) {
tcp_update_recv_tstamps(skb, tss);
- *cmsg_flags |= 2;
+ *cmsg_flags |= TCP_CMSG_TS;
}
if (used + offset < skb->len)
@@ -2513,9 +2558,9 @@ int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
release_sock(sk);
if (cmsg_flags && ret >= 0) {
- if (cmsg_flags & 2)
+ if (cmsg_flags & TCP_CMSG_TS)
tcp_recv_timestamp(msg, sk, &tss);
- if (cmsg_flags & 1) {
+ if (cmsg_flags & TCP_CMSG_INQ) {
inq = tcp_inq_hint(sk);
put_cmsg(msg, SOL_TCP, TCP_CM_INQ, sizeof(inq), &inq);
}
@@ -4099,6 +4144,7 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
}
#ifdef CONFIG_MMU
case TCP_ZEROCOPY_RECEIVE: {
+ struct scm_timestamping_internal tss;
struct tcp_zerocopy_receive zc = {};
int err;
@@ -4114,11 +4160,18 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
if (copy_from_user(&zc, optval, len))
return -EFAULT;
lock_sock(sk);
- err = tcp_zerocopy_receive(sk, &zc);
+ err = tcp_zerocopy_receive(sk, &zc, &tss);
release_sock(sk);
- if (len >= offsetofend(struct tcp_zerocopy_receive, err))
- goto zerocopy_rcv_sk_err;
+ if (len >= offsetofend(struct tcp_zerocopy_receive, msg_flags))
+ goto zerocopy_rcv_cmsg;
switch (len) {
+ case offsetofend(struct tcp_zerocopy_receive, msg_flags):
+ goto zerocopy_rcv_cmsg;
+ case offsetofend(struct tcp_zerocopy_receive, msg_controllen):
+ case offsetofend(struct tcp_zerocopy_receive, msg_control):
+ case offsetofend(struct tcp_zerocopy_receive, flags):
+ case offsetofend(struct tcp_zerocopy_receive, copybuf_len):
+ case offsetofend(struct tcp_zerocopy_receive, copybuf_address):
case offsetofend(struct tcp_zerocopy_receive, err):
goto zerocopy_rcv_sk_err;
case offsetofend(struct tcp_zerocopy_receive, inq):
@@ -4127,6 +4180,11 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
default:
goto zerocopy_rcv_out;
}
+zerocopy_rcv_cmsg:
+ if (zc.msg_flags & TCP_CMSG_TS)
+ tcp_zc_finalize_rx_tstamp(sk, &zc, &tss);
+ else
+ zc.msg_flags = 0;
zerocopy_rcv_sk_err:
if (!err)
zc.err = sock_error(sk);